Radar Online reports that a source with knowledge of the investigation told them it was "formally opened last week and is being taken very seriously by the department."

The source told Radar that "Will and Jada Pinkett Smith have been extremely cooperative with officials. Of course, they aren't happy that their parenting skills are under scrutiny, but they understand."

The picture, posted by Arias to social media, depicted the "Hannah Montana" actor shirtless in bed with the 13-year-old Smith. Though Arias later deleted the photo, an anonymous tip to authorities spurred the investigation.

Of course, the reported CPS investigation may also conclude that no harm was done.

According to Radar's source, CPS social workers will be talking with Willow and Arias, along with Willow's parents. "This won't just be one or two visits with the family, and it will likely be an open investigation for at least a month, out of an abundance of caution," the source said.